Two positives were recorded by for this event using video OSD technique.
One clearly observed miss was recorded for this event.
View the updated prediction.
Observers: 1 G McKay,Blenheim, New Zealand 2 B Allen,Blenheim, NZ 3(M) C Chad,Gunnedah, NSW,AU 4(P) Prediction, 28 Feb
The circle above is plotted at the expected 158 km diameter of Wratislavia. The two are too close to determine a certain position, and Chris's miss is not close enough to constrain a solution. So it is not possible to determine whether Bill and Graeme were north or south of the central line of the event. The ISAM 3D model has been overlaid on the plot and positioned so that the two shapes have approximately the same area and the chord are nearly central, however again the lack of separation means we cannot be sure of the position.
June 2013 -
It has been pointed out that there are two possible ISAM models with different spin axes for this object. The figure above shows the alternative one. However again the lack of separation means we cannot be sure of the of which is the correct one. However a second chord observed in Japan for the 2013 Feb 11 event for Wratislavia indicates that Model #2 above is the better fit.
The figure below shows the Bill's Tangra light curve of the occultation.
Observation details for MP ( 690 ) Wratislavia By Star UCAC2 23875474 On 2013-04-11 at 12:16:40.0 _______________________________ Observer Graeme McKay Location Blenheim, New Zealand Longitude +173:57 Latitude -41:32 Altitude 18 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 28 cm Seeing Steady Clear Camera Type WAT120N+ PAL/CCIR Camera Delay 0.35 Timing GPS - time inserted Video with frame analysis Disappearance 12:16:42.79 Reappearance 12:16:51.75 Comments: Good observing conditions. Very thin filmy cloud/haze did not affect visibility Report prepopulated by IOTA Reporting Add-in for OW ver.1.7 _______________________________ Observer Chris Chad Location Gunnedah, NSW,AU Longitude +150:15 Latitude -30:59 Altitude 315 m Datum WGS84 Telescope Newtonian Aperture 25 cm Seeing Steady Clear Camera Type Samsung SCB-2000 NTSC/EIA Camera Delay 0.01 Timing GPS - time inserted Video with frame analysis Missed Comments: Lovely clear night, best conditions for a long time. Clear miss. Report prepopulated by IOTA Reporting Add-in for OW ver.1.7 _______________________________ Observer Bill Allen Location Blenheim, NZ Longitude +173:50 Latitude -41:29 Altitude 38 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 40 cm Seeing Steady Clear Camera Type WAT120N+ PAL/CCIR Camera Delay 0.35 Timing GPS - time inserted Video with frame analysis Disappearance 12:16:42.97 Reappearance 12:16:52.37 Comments: Datum NZ1949 (topographical map)